When $1:2$ equivalence ratio of the gases $X$ and $Y$ are heated to $573 \ K - 673 \ K$ at $200-300 \ atm$ in the presence of $ZnO-Cr_2O_3$ catalyst,methanol is formed. Here,the gases $X$ and $Y$ are $X$ and $Y$ respectively.

Which of the following statements is not correct regarding the hydrogen atom?

Asthma patients use a mixture of ........... for breathing.

Consider the following statements:
$1.$ Atomic hydrogen is obtained by passing hydrogen through an electric arc.
$2.$ Hydrogen gas will not reduce heated aluminium oxide.
$3.$ Finely divided palladium adsorbs large volume of hydrogen gas.
$4.$ Pure nascent hydrogen is best obtained by reacting $Na$ with $C_2H_5OH$.
Which of the above statements is/are correct?

Match the following:

List-$I$	List-$II$
$A$. Electron-deficient hydride	$I$. $CH_4$
$B$. Electron-precise hydride	$II$. $B_2H_6$
$C$. Electron-rich hydride	$III$. $CaH_2$
$D$. Saline hydride	$IV$. $NiH_{0.6}$
	$V$. $PH_3$

Write the physical properties of $H_2$.